Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Liquid Radwaste System

The small lines carrying primary coolant outside containment are the reactor coolant system sample line and the discharge line from the chemical and volume control system to the liquid radwaste system. A sample line break is considered limiting because the flow rate will be marginally higher (29.5m /hr as opposed to the chemical and volume control system flow of 22.7m /hr) and the activity will be higher (as one of the functions of the chemical and volume control system is to remove activity). These lines are used only periodically. No instrument lines carry primary coolant outside the contaimnent. [Pg.138]

The reactor coolant system interfaces with a number of auxiliary systems, principally the ehemical and volume control system, the normal residual heat removal system, the steam generators, the primary sampling system, the liquid radwaste system and the eomponent cooling water system. [Pg.170]

The letdown flow outside containment isolation valve is a normally closed, fail closed, air-operated globe valve that isolates letdown to the liquid radwaste system. This valve automatically opens and closes on a plant control system signal from the pressuriser level control system or a containment isolation signal from the protection and safety monitoring system. Ibis valve operates in the same fashion as the letdown flow inside containment isolation valve. The letdown flow outside containment isolation valve eloses more quickly than inside containment letdown flow isolation valve to limit seat wear of inside containment isolation valve. This valve operator has a flow restricting orifice in the air line, so it opens more slowly than inside containment letdown flow isolation valve. In addition, during brief periods of shutdown, when the reactor coolant system is water solid, this valve throttles to maintain the reactor coolant system pressure. Manual control is also provided in the main control room and at the remote shutdown workstation. [Pg.216]

The liquid radioactive waste system is designed to collect, process, store and dispose of liquid radioactive waste generated as the result of normal operation, including anticipated operational occurrences such as reactor coolant system level reduction for refuelling. Nonradioactive secondary system waste is not processed by the liquid radioactive waste system however, if significant radioactivity is detected in secondary-side systems, blowdown or a portion of the blowdown may be diverted to the liquid radwaste system for processing and disposal. [Pg.229]

The radioactive waste drain system collects radioactive liquid wastes from equipment and floor drainage of the radioactive portions of the auxiliary building, aimex building, and radwaste building and directs these wastes to a centrally located sump located in the auxiliary building. The contents of the siunp are piunped to the liquid radwaste system tanks. [Pg.238]

The radiation monitors associated witii the steam generator blowdown system provide a means of recognising when the secondary side becomes radioactively contaminated, an indication of a steam generator tube mpture. The blowdown flow and the ion exchange waste stream (brine) flow are both continuously monitored for radioactivity. If such radioactivity is detected, the liquid radwaste system is aligned to process the blowdown and ion-exchange waste effluent. If radioactivity should exceed a preset level, the blowdown flow control valves and the isolation valves would automatically close. [Pg.258]

An alarm sounds in the main control room on detection of a high radiation level within the blowdown system, to alert the operators of the need to take the appropriate remedial action, such as aligning the liquid radwaste system to process the blowdown and ion-exchange waste effluent, and isolating the affected steam generator (Section 10.4.8.2.2 of Reference 6.1). [Pg.259]

The liquid radwaste processing areas are designed to contain any liquid spills, including a raised perimeter and floor drains that lead to the liquid radwaste system waste hold-up tanks. The foundation for the entire building is a reinforced concrete mat. [Pg.299]

Use simplified radwaste systems based on an ion exchange process for the liquid radwaste system and a charcoal bed system for the gaseous radwaste system ... [Pg.309]

Steam generator blowdown radiation monitors. The presence of radioactive material in the steam generator blowdown indicates a leak between the primary and secondary side of die steam generator. The monitor initiates an alarm in the main control room, initiates closure of the steam generator blowdown containment isolation and flow control valves and diverts flow to the liquid radwaste system. [Pg.441]

Primary containment is provided by the vessels/tanks and pipework that make up the liquid radwaste system. Secondary contairrment is provided by the concrete floor of the auxiliary building radwaste buildings, and the integrated drainage system including floor drains and collection sumps. The liquid radwaste system will be located internally, with no points where there could be leakage directly to external environment. Further details of the system ate provided in Environment Report (Section 3.4.3 and Tables 3.4.2 and 3.4.3) and Reference 14.2 (Section 11.2). [Pg.469]

Management systems and processes will be developed during the site licence application phase (as described in Chapter 9 of the PCSR). This will include systems and processes relating to the operation of the liquid radwaste system, including monitoring its integrity. [Pg.469]

The inputs to and outlet from the liquid radwaste system will be monitored, as outlined in UKP-GW-GL029 (Reference 14.14). Any leakage from the liquid radwaste system would be detected by the internal radiation monitoring system (see Chapter 12 of this PCSR). This leakage would be contained within the drainage system (and passed back through the system once leakage had been addressed). [Pg.469]

Liquid Radioactive Wastes - the Environment Report, section 3.3 of the Environment Report, (reference 15.6) summarises the sources of liquid radioactive waste, the liquid radwaste system (WES), and a BAT assessment for the chosen design options. [Pg.483]

The liquid radwaste system is described in detail in Section 11.2 of Reference 15.14 and summarised in the Environment Report (reference 15.6). The liquid radwaste system is based on well-established ion exchange technology. [Pg.484]


See other pages where Liquid Radwaste System is mentioned: [Pg.64]    [Pg.23]    [Pg.46]    [Pg.197]    [Pg.208]    [Pg.210]    [Pg.216]    [Pg.229]    [Pg.419]    [Pg.462]    [Pg.465]    [Pg.469]    [Pg.484]   


SEARCH



© 2024 chempedia.info